Bridging-block for dynamo-electric machines.



P. W. YOUNG. BRIDGING BLOCK FOR DYNAMO ELECTRIC MACHINES.

APPLIOATION TILED AUG. 19, 1908.

Patented Apr. 18, 1911.

Inventor, Frederic]? WmYBung;

1 y Aflorney.

Wi1nesses= wzmm W/% America, and aresident I county of Essex; and State of New Jersey,

sure sufficiently to UNITED snares FREDERICK WM. YOUNG, 0F

Pannier EAST ORANGE, NEW JERSEY, ASSIGNOR TO CROCHET;- WHEELER GOMPANY, 0F AMPERE, NEW JERSEY, A CORPORATION OF NEW JERSEY BRIDGING-BLOCK FOB DYNAMIC-ELECTRIC MACHINES.

Specification of Letters Patent. Application filed August 19, 1908.

Patented Apr. it Mill.

Serial No. 449,220.

T0 alljw'lzomet may concern.

Be it" known-that I, FREDERICK' VILLIAM YoUnG, a citizen of the United States of of East Orange,

haveinvented certain new and useful Improvementsin Bridging-Blocks for Dynamo- Electric Machines, is a specification.

The objectof this invention is to provide in connection with a dynamo-electric machine element, the periphery of which is slotted to receive and retain windings, means for a substantial-magnetic closureof the slots above the windings so as to secure a sutliciently uniform magnetic flux into and out of the element.

A further object is to interrupt such clopre'vent material mag netic leakage between the teeth above the windings.

A further object is to so construct the blocks that they will not be a seat for harmful eddy currents. They also serve as wedges for bindingthe windings in place, are manufactured with facility with accurate control of cross-section'and uniformity, and possess some elasticity permitting of ready when in place.

In the accompanying sheet of drawings which forms a part of this application Figures 1, 2 and 3 are perspectives of three forms of bridging-blocks involving my invention and drawn to an enlarged scale. Fig. 4 is a face view of a portion of an armature provided with bridging-blocks such as are illustrated in Fig 1.

The bridging-block in the form illustrated in Fig. 1 is provided with a core consisting of a strip of iron 0. This core is insulated with a wrapping of paper or a coating of japan 7). The insulated core is wrapped with :1 sheet of iron 2' which lies across one side of the core and has its edges c e folded over the edges and against the other side of the core, the edges preferably not lapping or touching. The section of the iron wrapping which extends across one side of the core is perforated at intervals, as by longitudinal slots 8 s. The, bridging-block is applied to a laminated armature-core iii which constitutes a dynamo-electric machine element with coil-retaining slots in its peof which the following assembly and insuring security 7 riphery, and has windings 1r 7L located in the slots. The walls of the slots are notched near their mouths to receive and retain the bridging-blocks. The bridging-blocks are preferably electrically separated from the laminae of the arn'iature-core by insulation g plied to the sheet or fiber walls. t

In the form shown in Fig. 2 the core consists of a plurality of strips or laininations of sheet iron, two strips 0 0 being illustrated. j

In the form shown in Fig. 3 the iron strips of the core are in the form of round wires 0% 0 disposed longitudinally inthe wrapping, in two-groups'or bundles spaced apart so as to better-reduce magnetic leak: age over the windings.

The insulation between the blocks and the armature core, as Well as that between the cores of the blocksand the sheet iron wrappings, is not material to the mechanical structure, and is thin so that there will be a ready passage for the magnetic iiui: b tween the iron parts of the blocks and the adjoining teeth of the armature core. lite sistance across the blocks is beneficial be cause it prevents shunting of magnetism across the slots above the'windings. This resistance is localized as far as possible at the middle axes of the blocks so as not to reduce the magnetic flux between the iron parts of the blocks and the adjoining teeth of the armature core.

What I claim as new, and desire to secure by Letters Patent of the United States, is

1. The combination with a dynamo-elec- .tric machine element having coil-retaining slots, of windings located in the slots, and slot-closing bridgingblocks each consisting of a core and a folded sheet iron envelop which extends and isfolded over the opposite edges thereof. substantially as described.

2. The combination with a dynamo-electric machine element having coil-retaining slots, of windings located in the slots, and slot-closing bridging-blocks each consisting of an iron core and a folded sheet iron envelop which extends across one side of the core and is folded over the opposite edges thereof, substantially as described.

iron wrapping, or paper placed in the notches inthe slot which may be either a coat of japan apQ across one side of the core with a dynamo-electrio machine element having coil-retaining slots, of windings located in the slots, and

slot-closing bridging-blocks each consisting of an iron core formed of a plurality of parallel strips of ironand a," folded sheet iron envelop which extends across one side of the core and has each edge folded over one of the core strips, substantially as described.

l. The combination with a. dynamo-electric machine element having coil-retaining slots, of windings located in the slots, and slot-closing bridging-blocks each consisting of a core and a folded sheet iron envelop The combination which extends across one side of the core and folded over the opposite edges thereof, the section which extends across one side of the core being perforated, substantially as described.

As an article of manufacture, a slotelosing bridging-block consisting of a core and a folded sheet iron envelop which extends across one side of the core and is folded over the opposite edges thereof, sub stantially as described.

(i. As an article of manufacture, a slotclosing bridging-block consisting of an iron core and a folded sheet iron envelop which extends across one side of the core and is tends across one by a thinner central portion,

folded over the opposite edges thereof, substantially as described.

7. As an article of manufacture, a slot closing bridging-block consisting of an iron core formed of a plurality of strips of iron and a folded sheet iron envelop which exside of the core'and has each edge folded over one of the core strips, substantially as described.

8. As an article of manufacture, a slot closing bridging-block consisting of a core and a folded sheet iron envelop which extends across one side of the core and is folded over the opposite edges thereof, the' section which extends across one side of the core being perforated, substantially as described.

9. In a dynamo-electric machine, a slotelosing device consisting of magnetic material having its longitudinal sides bent upon themselves to provide thick edges connected as described.

- Signed by me at East Orange, New Jersey, this 17th day of August, 1908.

FREDERICK YVM. YOUNG. Vitncsses C. N. \Vnnnnnn, J. lVI. SMITH.

Copies of this patent may be obtained forfive cents each, by addressing the Commissioner of Patents,

Washington, I). C."

substantially 

